事实上，Darwin更加近似于BSD家族成员中的一员；它是一个完整的系统，包括一个XNU内核，以及一套外围程序(userland)。

In fact, Darwin is closer to being an analog of a member of the BSD family; it's a complete system including a kernel, XNU, and a set of userland applications.

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如果认为该信息对于传递的主要信息而言是外围的或者附属性的，或者单纯用于帮助程序处理传递的主要信息，则使用属性。

If you consider the information to be peripheral or incidental to the main communication, or purely intended to help applications process the main communication, use attributes.

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WS-POS 的根本优点在于能够将 POS 外围设备作为服务来提供，这些服务可由远程 POS 应用程序进行访问，包括移动 POS 解决方案。

The fundamental benefit of WS-POS is the ability to provision POS peripherals as services that can be accessed by remote POS applications, including mobile POS solutions.

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